23.8*9.9 2.38能简算

23.8*9.9 +2.38=2.39*99+2.38=2.38*(99+1)=238

2.5x9.9用简便方法怎么计算?

=2.5*(10-0.1)=2.5*10-2.5*0.1=25-0.25=24.75

3.8x9.9怎样简便计算?

3.8X9.9 =3.8X(10一0.1) =3.8X10一3.8X0.1 =38一0.38 =37.62

24.3X9.9的简便计算

24.3X9.9=24.3*(10-0.1)=24.3*10-24.3*0.1=243-2.43=240.57

46.2乘9.9怎么简算

46.2乘9.9这么简算:46.2X10,很好计算,等于462;再减去多出来的0.146.2 X 0,1 = 4.62 即462 - 4.62 = 457.38;列出式子:46.2 X 9.9=46.2 X (10 - 0.1)=462 - 4.62 = 457.38

18.9x9.9怎么简算

18.9x9.9=18.9x(10-0.1)=189-1.89=187.11

24.8x9.9简便计算

你好!=24.8*(10-0.1)=248-2.48=245.52 如有疑问,请追问.

3.5x9.9简便计算.

3.5x9.9简便计算=3.5*(10-0.1)=3.5*10-3.5*0.1=35-0.35=34.65

34X9.9的简便运算

34x9.9=34*(10-0.1)=34*10-34*0.1=340-3.4=336.6

19.6*9.9 怎样简便计算

19.6(10-0.1)=196-1.96=194.04